Do you want to send the notification to you Android or IOS application?For that you have to make http call from your web service / Web application. Just have one rest call in your IOS / Android get the data as JSON input based on the input you can create notification.

No you can call that REST Call from your web application / Web service. It is nothing but simple Http client call.

Hi,If you are trying XAMARIN then this is the solution. XAMARIN allows you to code for IOS as well as Android at same time in a single project. You need to first install 'Push Notification Plugin for Xamarin' through Package Manager Console in VS and after that implement the 'IPushNotificationListener interface'.Please find the deo source code here:https://web.archive.org/web/20150524090527/http://lemoncode.net/2015/04/17/adding-push-notifications-to-your-xamarin-forms-application-part-1